166506001065055 has 4 divisors (see below), whose sum is σ = 199807201278072. Its totient is φ = 133204800852040.

The previous prime is 166506001065043. The next prime is 166506001065091. The reversal of 166506001065055 is 550560100605661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 166506001065055 - 2⁵ = 166506001065023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166506001064996 and 166506001065014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16650600106501 + ... + 16650600106510.

It is an arithmetic number, because the mean of its divisors is an integer number (49951800319518).

Almost surely, 2^{166506001065055} is an apocalyptic number.

166506001065055 is a deficient number, since it is larger than the sum of its proper divisors (33301200213017).

166506001065055 is an equidigital number, since it uses as much as digits as its factorization.

166506001065055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33301200213016.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 166506001065055 in words is "one hundred sixty-six trillion, five hundred six billion, one million, sixty-five thousand, fifty-five".